Calculator casing



FIG. 1 is a view in perspective of a calculator casing showing our new design;

FIG. 2 is a plan view thereof, on an enlarged scale;

FIG. 3 is a front elevational view thereof, on an enlarged scale;

FIG. 4 is a side elevational view thereof, on an enlarged scale; and

FIG. 5 is a rear elevational view thereof, on an enlarged scale.

The bottom side of the calculator casing is plain and conventional. 

The ornamental design for a calculator casing, substantially as shown and described. 